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Versions: 38
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Contents
module Redcar
class Plugin
class Storage
class << self
attr_writer :storage_dir
end
def self.storage_dir
@user_dir ||= File.join(Redcar.user_dir, "storage")
end
# Open a storage file or create it if it doesn't exist.
#
# @param [String] a (short) name, should be suitable for use as a filename
def initialize(name)
@name = name
unless File.exists?(Storage.storage_dir)
FileUtils.mkdir_p(Storage.storage_dir)
end
rollback
end
# Save the storage to disk.
def save
File.open(path, "w") { |f| YAML.dump(@storage, f) }
update_timestamp
self
end
# Rollback the storage to the latest revision saved to disk or empty it if
# it hasn't been saved.
def rollback
if File.exists?(path)
@storage = YAML.load_file(path)
raise 'storage file is corrupted--please delete ' + path unless @storage.is_a? Hash
update_timestamp
else
@storage = {}
end
self
end
# retrieve key value
# note: it does not re-read from disk before returning you this value
def [](key)
if @last_modified_time
if File.stat(path()).mtime != @last_modified_time
rollback
end
end
@storage[key]
end
# set key to value
# note: it automatically saves this to disk
def []=(key, value)
@storage[key] = value
save
value
end
def set_default(key, value)
unless @storage.has_key?(key)
self[key] = value
end
value
end
def keys
@storage.keys
end
private
def path
File.join(Storage.storage_dir, @name + ".yaml")
end
def update_timestamp
@last_modified_time = File.stat(path()).mtime
end
end
end
end
Version data entries
38 entries across 38 versions & 1 rubygems